JPH0229357U

JPH0229357U -

Info

Publication number: JPH0229357U
Application number: JP10695788U
Authority: JP
Priority date: 1988-08-15
Filing date: 1988-08-15
Publication date: 1990-02-26

Description

[Brief explanation of the drawing]

第１図はこの考案の第１実施例の断面図、第２
図および第３図は第１図におけるシール部材の他
の態様を示す断面図、第４図は第２実施例に使用
されるシール部材の断面図、第５図は従来の磁性
流体シール装置を使用した磁気デイスク装置の断
面図、第６図は第５図の要部拡大断面図、第７図
は第６図の要部拡大図である。Ｃ_１……シール部材、３ａ……内輪（磁性部材
）、３ｂ……外輪、４，５……環状のポールピー
ス、６……環状の磁石、６ａ……切り欠き部、７
ａ……シールギヤツプｇの磁性流体、７ｂ……第
２環状溝ｍ_２に保持された磁性流体、ｍ_１……第
１環状溝、ｍ_２……第２環状溝、ｇ……シールギ
ヤツプ。なお、各図中、同一符号は同一または相
当部分を示す。 Figure 1 is a sectional view of the first embodiment of this invention;
3 and 3 are sectional views showing other aspects of the seal member in FIG. 1, FIG. 4 is a sectional view of the seal member used in the second embodiment, and FIG. 5 is a sectional view of a conventional magnetic fluid sealing device. 6 is an enlarged sectional view of the main part of FIG. 5, and FIG. 7 is an enlarged view of the main part of FIG. 6. C ₁ ... Seal member, 3a... Inner ring (magnetic member), 3b... Outer ring, 4, 5... Annular pole piece, 6... Annular magnet, 6a... Notch, 7
a...Magnetic fluid in seal gap g, 7b...Magnetic fluid held in second annular groove _m2 , _m1 ...first annular groove, _m2 ...second annular groove, g...seal gap. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims

[Claims for Utility Model Registration] (1) A seal member formed by coaxially fixing two annular pole pieces to both end faces of an annular magnet, and a seal gap between the two annular pole pieces. a magnetic member that coaxially rotates relative to the seal member, and a magnetic fluid held in the seal gap by the magnetic force of a magnet, and a peripheral edge of the seal member that faces the magnetic member via the magnetic fluid; In a sealing device having a first annular groove formed by two annular pole pieces and an annular magnet, a second annular groove is provided in the first annular groove along the pole piece, and the second annular groove is provided in the first annular groove. A magnetic fluid sealing device characterized in that the width of the annular groove is equal to or less than the distance between the annular magnet and the magnetic member. (2) The magnetic fluid seal device according to claim 1, wherein the annular magnet is provided with a connecting groove that connects the two second annular grooves along the pole piece.